국제회의 참가보고 - 제9차 AWF 회의

김정삼,위규진,박주홍,김대중,정용준,Kim, Jeong-Sam,Wi, Gyu-Jin,Park, Ju-Hong,Kim, Dae-Jung,Jeong, Yong-Jun 한국정보통신기술협회 2010 TTA저널 Vol.131 No.-

사이클 스리핑 현상이 있는 통신 시스템의 동기 복원에 관한 연구

김정삼 慶北專門大學 1996 慶北專門大學 論文集 Vol.15 No.-

α-Adrenalin 作用遮斷劑가 Noradrenalin에 의한 Pitressin 抗利尿抑制作用에 미치는 影響

金政三,洪淳國 고려대학교 의과대학 1976 고려대 의대 잡지 Vol.13 No.1

The infusion of noradrenalin, the principal endogenous alpha-adrenergic agent, to man and animal have been shown to increase urine volume and free water clearance without altering glomerular filtration rate but occasionally apparent reduction of renal plasma flow. This effect was the most marked in subjects who started with a negative free water clearance, presumably resulting with elevated levels of antidiuretic hormone. The several reports have been showed that noradrenalin antagonizes action of antidiuretic hormone on the toad bladder in vitro, and The action of exogenous antidiuretic hormone given to water loading subjects also inhibits by noradrenalin in vivo. Many of the polypeptide hormones, including antidiuretic hormone, cause activation of adenyl cyclase as a step in their mechanism of action. This enzyme has been thought of as the beta-adrenergic receptor. Alpha-adrenergic drugs cause diuresis but beta-adrenergic drugs antidiuresis in the normally hydrated rat. To clarify the mechanism by which adrenergic drug alter water excretion and the action of antidiuretic hormone, water were infused with combinations of these drugs and its blocking agent into unanesthetized rabbit. On experiments 20 rabbits were infused with 2.5% dextrose solution until water diuresis was maintained and thereafter simultaneous administration of pitressin (20 micro U/㎏ per min), pitressin (20 micro U/㎏ per min) plus noradrenalin(0.5 micro g/㎏ per min) and then pitressin(20 micro U/㎏ per min) plus noradrenalin(0.5 micro g/㎏ per min) plus regitin(3.5 micro g/㎏ per min) were successfully performed. During experiments urine volume, inulin clearance, osmolar clearance, free water clearance and sodium excretion were measured for four consecutive specimens every twenty minutes intervals respectively. The results were as follows: (1) Water diuresis was inhibited by pitressin. (2) Pitressin induced antidiuresis was inhibited by noradrenalin. (3) Regitin, alpha-adrenergic blocking agent inhibited the effect of noradrenalin on pitressia induced antidiuresis. (4) Osmolar clearance, free water clearance, glomerular filtration rate and sodium excretion were not altered by pitressin, noradrenalin and regitin.

[특집/기술해설]BcN 정책 추진방향

김정삼,서홍석 대한전자공학회 2003 텔레콤 Vol.19 No.1

사이버보안 실무전문가 양성을 위한 NCS기반 마이크로 디그리 인증 모델

김정삼,이규창,최상용 한국컴퓨터정보학회 2022 韓國컴퓨터情報學會論文誌 Vol.27 No.8

In this paper, we propose a Leveled Micro-Degree Job Competency Certification Model that considers the level of the job based on the job defined in the NCS. There is a mismatch of manpower due to the problem of university education that cannot keep up with the rapidly changing technological environment caused by the 4th Industrial Revolution. The Nano-Degree and Micro-Degree systems designed to solve this problem are used for job competency certification of cyber security personnel. NCS sub-categorized job field is defined as Micro-Degree and detailed job by ability unit is defined as Nano-Degree, the level of the ability unit defined by level is equally applied to the Micro-Degree. And it is a system that certifies the job competency corresponding to the degree-based university academic background. By applying this system to the curriculum of Cyber Security School, Yeungnam University College, we proposed a method to configure the Nano-Degree course based on NCS duties. The method proposed in this paper can be used as a method for verifying job competency of Nano-Degree and Micro-Degree, which are recently introduced by many universities. 본 논문에서는 NCS에서 정의된 직무를 기반으로 직무의 수준을 고려한 수준별 마이크로디그리 직무능력인증 모델을 제안한다. 4차 산업혁명 등 빠르게 변화하는 기술환경을 따라가지 못하는 대학교육의 문제로 인해 인력의 미스매치가 발생하고 있다. 이를 해결하기 위해 고안된 나노디그리와 마이크로디그리 체계를 사이버보안 인력의 직무능력 인증에 활용한다. NCS의 세분류 분야별 직무를 마이크로디그리, 능력단위별 세부직무를 나노디그리로 정의하고, 수준별로 구분된 능력단위의 수준을 마이크로디그리에 동일하게 적용한다. 그리고 이를 학위기반의 대학 학력에 상응하는 직무능력을 인증하는체계이다. 이러한 체계를 영남이공대학교 사이버보안스쿨의 교육과정에 적용하여 NCS직무 기반으로나노디그리 과정을 구성하는 방안을 제안하였다. 본 논문에서 제안하는 방법은 최근 들어 많은 대학들이 도입하고 있는 나노디그리와 마이크로디그리의 직무역량 인증을 위한 방법으로 사용가능하다.

애드 혹 네트워크에서 지역 밀집도에 적응적인 확률적 플러딩 기법

김정삼,류정필,한기준,Kim Jeong-sahm,Ryu Jeoung-pil,Han Ki-Jun 대한전자공학회 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.9

In ad hoc networks, many applications use the broadcast service that is elementary operation to support various important functions such as route discovery procedure. This paper presents several adaptive probabilistic broadcast schemes base on local information to alleviate the broadcast storm problem for wireless ad hoc network. Our schemes dynamically determine the rebroadcast probability at each node based on the neighbor information within two-hop span. Simulation results are presented, which show our schemes have a better performance over the deterministic flooding approach. 애드 혹 네트워크에서 브로드캐스트 서비스는 페이징 및 경로 탐색 절차 등에서 사용되는 가장 기초적이며 중요한 기능 중의 하나이다. 모든 노드들이 브로드캐스트를 수행하는 블라인드 플러팅은 노드들의 중복되는 전파범위로 인하여 동일한 패킷의 중복 수신이 많아지고, 특히 밀집도가 높은 지역에 있는 노드들은 과도한 브로드캐스트 패킷의 송수신으로 인하여 실질적인 데이터 전송에 많은 지장을 초래하게 되어 종국에는 브로드캐스트 스톰 문제에 봉착하게 된다. 본 논문에서는 브로드캐스트 스톰의 영향을 줄이기 위하여 동적인 확률을 이용한 브로드캐스트 기법을 제안한다. 노드는 1흡 및 2홉 내의 이웃 노드 밀집도에 근거하여 브로드캐스트 확률을 계산하고 이 확률에 따라 각 노드는 브로드캐스트 수행 여부를 결정한다. 본 논문에서는 모의실험을 통하여 제안 기법의 성능을 검증하였다.

이동단말의 이동특성 및 통화특성을 고려한 동적 위치등록기법

김정삼 영남이공대학 산업기술연구소 2002 産業技術硏究 Vol.14 No.-

Wireless mobile communication networks provide seamless and uninterrupted communication to mobile subscribers. Users carrying mobile terminals (MTs) can communicate with a remote terminal, regardless of its current location and mobility pattern. The location management is needed to discover the current attachment point of the mobile terminal in order to correctly route incoming calls. There are two commonly used standards for mobility management: IS-41 and GSM. The IS-41 is commonly used in North America while GSM is generally used in Europe. And number of schemes are proposed to keep track of the up-to-date location of each mobile terminal. However, these schemes are only suitable for certain types of user with a specific range of call-to-mobility ratio(CMR). In this paper, we propose an advanced location management scheme that can reduce the location registration cost and call delivery at the same time in a mobile communication networks and adapt to various CMRs. Therefore, our scheme may be feasible in an even larger network with many users and can achieve better performance than the current methods regardless of user call and mobility patterns.

기상화학증착법으로 성장한 알루미늄 도핑된 산화아연 박막의 전도성 향상을 위한 공정변수연구

김정삼,양건우,권성구 한국표면공학회 2016 한국표면공학회 학술발표회 초록집 Vol.2016 No.5

IEEE 802.11 무선랜에서의 동적 컨텐션 윈도우 관리기법

김정삼,양천석,Kim, Jeong-sahm,Yang, Chun-suk 한국정보과학회 2005 정보과학회논문지 : 기술교육 Vol.2 No.1

DCF에서는 binary slotted exponential backoff 기반의 CSMA/CA기법을 사용한다. 이 기법에는 컨텐션 윈도우의 크기가 매 충돌발생시 지수함수적으로 증가하기 때문에 충돌확률을 줄이는 데는 아주 효과적이다. 하지만 이로 인하여 데이터의 전송지연이 발생하는 원인이 되기도 한다. 본 논문에서는 채널의 활용도를 고려하여 컨텐션 윈도우의 크기를 동적으로 변화시키는 새로운 백오프기법을 제안한다. 이 기법은 프로토콜의 처리성능을 향상시키고 패킷의 평균 전송지연시간을 감소시킬 것이다. The Distributed Coordination Function (DCF)uses a Carrier Sense Multiple Access with Collision Avoidance (CSMA/Ch) scheme with a binary slotted exponential backoff. This exponential increasing CW is very effective to decrease the probability of collision. But, it sometimes acts as the cause of delay of data transmission. In this paper, we propose an adaptive backoff mechanism which tunes the value of CW parameter depending on the status of channel activity. Our mechanism increases the protocol throughput and reduces the average packet delay without any overhead.

무선 센서네트워크에서 네트워크수명 극대화 방안

김정삼 (사)디지털산업정보학회 2014 디지털산업정보학회논문지 Vol.10 No.2

In this paper, I propose a new energy efficient clustering scheme to prolong the networklifetime by reducing energy consumption at the sensor node. It is possible that a nodedetermines whether to participate in clustering with certain probability based on localdensity. This scheme is useful under the environment that sensor nodes are deployedunevenly within the sensing area. By adjusting the probability of participating in clusteringdynamically with local density of nodes, the energy consumption of the network is reduced. So, the lifetime of the network is extended. In the region where nodes are densely deployed,it is possible to reduce the energy consumption of the network by limiting the number ofnode which is participated in clustering with probability which can be adjusted dynamicallybased on local density of the node. Through computer simulation, it is verified that the proposed scheme is more energyefficient than LEACH protocol under the environment where node are densely located in aspecific area.